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 <h2 class="title">安装</h2>
 <p class="para">
  此扩展被认为已无人维护及已消亡。然而，此扩展的源代码还可在
<abbr title="PHP Extension and Application Repository">PECL</abbr>
<abbr>SVN</abbr> 找到：
  <a href="https://svn.php.net/viewvc/pecl/fdf" class="link external">&raquo;&nbsp;https://svn.php.net/viewvc/pecl/fdf</a>.
 </p>
 <p class="para">
  This extension is no longer bundled with PHP.
 </p>
 <blockquote class="note"><p><strong class="note">注意</strong>: 
  <span class="simpara">
   If you run into problems configuring PHP with fdftk support, check
   whether the header file <var class="filename">fdftk.h</var> and the library 
   <var class="filename">libfdftk.so</var> are at the right place. 
   The <strong class="command">configure</strong> script supports both the directory structure of the
   FDF SDK distribution and the usual <var class="filename">DIR/include</var> / 
   <var class="filename">DIR/lib</var> layout, so you can point it either 
   directly to the unpacked distribution directory or put the header 
   file and the appropriate library for your platform into e.g. 
   <var class="filename">/usr/local/include</var> and 
   <var class="filename">/usr/local/lib</var> and configure with 
   <strong class="option configure">--with-fdftk=/usr/local</strong>.
  </span>
 </p></blockquote>
 <blockquote class="note"><p><strong class="note">注意</strong>: 
  <strong>Note to Win32 Users</strong><br />
  <p class="para">
   为了使此扩展生效，
<abbr title="Dynamic Link Library">DLL</abbr> 文件必须能在 Windows 系统的
<var class="envar">PATH</var> 指示的路径下找到。如何操作的信息，请参见题为“<a href="faq.installation.html#faq.installation.addtopath" class="link">如何在 Windows 中将 PHP
目录加到 PATH 中</a>”的<abbr title="Frequently Asked Questions">FAQ</abbr>。虽然将
DLL 文件从 PHP 文件夹复制到 Windows 系统目录也行，但不建议这样做。
<em class="emphasis">此扩展需要下列文件在 <var class="envar">PATH</var> 路径中：</em>
   <var class="filename">fdftk.dll</var>
  </p>
 </p></blockquote>
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